Magical Sesame Ring opens gates of public transit

The days of rummaging frantically for the card that gets us onto public transit may be over.

A team of engineers from MIT has created the 3D-printed "Sesame Ring," which has an embedded RFID tag that lets you tap it to a RFID-based fare reader and hop on.
— The Atlantic Cities

Syncing public transit and wearable technology, the waterproof Sesame Ring can be used in place of the Charlie Card, Boston's mass transit smart card. Available in customizable colors and sizes, the first batch of $17 rings have already sold out, but their Kickstarter campaign will ensure that you get yours by Christmas.